A pond is one of the most generous things you can add to a small garden. Even a modest pool, roughly the size of a dining table, will pull in frogs, smooth newts, damselflies and a whole cast of beetles and bugs that you simply won't see anywhere else. The good news is that wildlife ponds need far less fuss than ornamental ones. No filters, no fish, no chemicals — just water, gentle edges and a decent bit of sunshine.

Choosing the Right Spot

Position matters more than size. Aim for a spot that gets at least five or six hours of direct sun a day, because dragonflies, damselflies and most aquatic plants need warmth to thrive. A little shade in the afternoon is useful, though, as it helps keep the water from overheating in a hot July.

Keep it away from the drip line of large trees and shrubs. Falling leaves and roots cause trouble: leaves rot down and feed algae, and willow, poplar and poplar-adjacent roots can puncture a liner. If you have no choice, a smaller pond with a raised edge can work well.

• Sun: open and bright, ideally south or west facing.
• Shelter: a hedge or fence nearby, but not so close it shades the water.
• Access: leave a quiet, undisturbed corner of the garden next to it — long grass, a log pile, a few stacked stones.

Digging and Shaping: Gentle Slopes Matter

The secret of a good wildlife pond is the profile of the hole. Creatures need shallow water to enter and leave safely, and plants need different depths. So build in gentle slopes rather than steep sides.

For a pond around 2 metres by 1.5 metres, dig out a shape with irregular, wavy edges — straight lines look artificial and offer less edge habitat. Then create:

• A shallow beach: one end sloping gradually to about 5 cm deep, so birds can bathe, hedgehogs can drink and frogs can haul themselves out.
• A marginal shelf: a broad ledge 20–30 cm deep around much of the edge for bog and marginal plants.
• A deeper centre: 60–75 cm in the middle, which keeps the water cooler in summer and stops it freezing solid in winter. In a small garden, avoid going deeper than 80 cm.

Line the hole with a good-quality flexible butyl or EPDM liner, laid over a layer of soft sand, old carpet or purpose-made underlay to protect it from stones. Leave plenty of overhang, tuck it into a shallow trench around the rim, and hide the edge with turf, stone or gravel.

Filling Up and Planting

Fill the pond with rainwater from a butt if you can, and top it up the same way thereafter. Tap water is acceptable if you must, but it carries nutrients that encourage algae, so use it sparingly. Let the water settle for a few days before planting.

Plant in baskets of hessian or aquatic mesh, using a heavy loam-based compost rather than ordinary potting compost, which floats and fouls the water. Then aim for a balance of three groups:

• Submerged oxygenators: hornwort and water starwort, which keep the water clear and give newts somewhere to lay eggs.
• Marginals: marsh marigold, water mint, brooklime, ragged robin, purple loosestrife and yellow flag iris for nectar and cover.
• Floating and surface: a small water lily or frogbit to shade the water and reduce algae.

Cover roughly a third of the surface with leaves. More than that and the water can become stagnant; less and algae will take hold. Buy plants from reputable aquatic nurseries and never take plants from the wild or move frogspawn between ponds — that is how disease and invasive species spread.

Do not add fish. Even a few goldfish will eat tadpoles, newt larvae and dragonfly nymphs, and they turn clear water into a murky soup. Avoid invasive plants too: floating pennywort, parrot's feather, water fern and New Zealand pygmyweed are all best left alone.

Building in a Sunny, Sheltered Edge

This is where the wildlife actually happens. Dragonflies patrol warm, sheltered water margins and use vertical stems to emerge from their nymph stage; frogs and newts bask in the shallows; bees and hoverflies visit the flowers at the water's edge.

• Leave a strip of long grass and native wildflowers on the sunny side, uncut until late summer.
• Add a few flat stones set at the water's edge, plus a short ramp of roughened wood or stone from the beach, so anything that falls in can climb out.
• Stack a small pile of logs and stones a metre or two away — a perfect damp retreat for frogs, newts and slow worms.
• Keep a shallow dish of water among the marginal plants for hedgehogs and birds, so they don't have to risk the pond.

Looking After It Through the Year

Wildlife ponds thrive on a light touch. In spring, pull out excess blanketweed by twirling it around a stick, and thin oxygenators if they have filled the pond. In summer, top up with rainwater during dry spells and leave seed heads standing for insects and birds.

Autumn leaves are the main chore. A few are fine and feed the ecosystem, but a thick blanket will rot and starve the water of oxygen. Scoop them out with a net, and if you must net the pond, stretch it taut above the water rather than letting it sag in — frogs, hedgehogs and birds can become tangled in loose mesh.

Never use herbicides, algaecides or dyes, and leave the pond alone in winter. Once the plants establish and the water clears, your pond will look after itself — and by the following spring, you'll almost certainly have frogs calling from it.